I am reading data from an energy meter over modbus protocol and I am getting hex values from there. I want to convert that hex string to floating point value. For example - 0x416f0000 denotes a value of 14.9375.Reference
Can anyone please help me how to do it on Arduino IDE?
If you do indeed have an ASCII string of hexadecimal numbers (and not a raw binary float), then your best option may be to do the conversion in two steps:
strtoul()For example, the following program:
void setup() {
const char modbus_data[] = "416F0000";
union {
uint32_t i;
float f;
} data;
data.i = strtoul(modbus_data, NULL, 16);
Serial.begin(9600);
Serial.println(data.f, 4);
}
void loop(){}
prints 14.9375.
Note that for strtoul() to function properly, the hex string must be
followed by a character that is not a valid hex digit (a \0 in the
example above).
